Originally Posted by NJ-
Could see you to about 150-160bhp I would have thought. The manifold will give you more top end power & torque thou.
The 1.8 Focus comes with 115bhp from the factory. I doubt that a de-cat, exhaust system and manifold will add 35-45bhp to a normally aspirated car without a re-map.
the book says they have 115bhp

- though most knock out about 120bhp. If all of that is mapped using some kind of after market management he'd get 150bhp. I've seen a 1.8 with the same mods near enough running 150bhp and had a unichip for the engine management.
Mercer